Dou Wen-Qing, He Hao, Song Wen-Ping, Wang Shu-Guang, Dai Dong-Wei
Ordos Energy Chemical Co., Ltd., China National Coal Group Corp., Ordos 017300, China.
Appraisal Center for Environment and Engineering, Ministry of Environmental Protection, Beijing 100012, China.
Huan Jing Ke Xue. 2019 Feb 8;40(2):761-767. doi: 10.13227/j.hjkx.201811028.
For the problem that few technologies can be directly used to treat wastewater with middle and low salt, in this study, arbuscular mycorrhizal (AM) fungi were used to enhance the tolerance of wetland plants to salt stress. Ecological floating beds (EFBs) enhanced with AM fungi were constructed to explore a new technology as well as to treat wastewater with low and medium salt content, but also to overcome the low tolerance to salt stress and low salt removal by EFB plants. Results showed that canna plants ( L.) were well colonized by AM fungi () and the mycorrhizal colonization rate was not affected by salt stress. Inoculation with AM fungi enhanced the ability of the EFBs to treat saline wastewater. After treatment by EFB with AM for 21 d, removal rates of total dissolved solids (TDS), chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) were 36.1%, 74.4%, 57.6%, and 59.1%, respectively, which were higher by 79.2%, 36.4%, 32.7%, and 37.6% over those with treatment by EFB without AM, respectively. Removal rates of Na, K, Ca, and Mg were 34.4%, 61.3%, 57.4%, and 51.9% after 21 d of treatment by EFB with AM, which were higher by 11.4%, 37.1%, 18.3%, and 24.6%, respectively, than removal rates with treatment by EFB without AM, respectively. Plant sample analysis showed that AM increased the Na uptake of plants and Na transportation from root to shoot, and this may be the reason that AM enhanced the ability of the EFBs to treat saline wastewater. This study indicated that AM fungi can be used to improve the ability of EFB to remedy water pollution and increase salt removal efficiency.
针对很少有技术能直接用于处理中低含盐量废水这一问题，本研究利用丛枝菌根（AM）真菌提高湿地植物对盐胁迫的耐受性。构建了接种AM真菌的生态浮床（EFBs），以探索一种新技术，该技术不仅能处理中低含盐量的废水，还能克服EFB植物对盐胁迫耐受性低和除盐率低的问题。结果表明，美人蕉（Canna indica L.）能被AM真菌良好地定殖，且菌根定殖率不受盐胁迫影响。接种AM真菌提高了EFBs处理含盐废水的能力。经接种AM真菌的EFB处理21天后，总溶解固体（TDS）、化学需氧量（COD）、总氮（TN）和总磷（TP）的去除率分别为36.1%、74.4%、57.6%和59.1%，分别比未接种AM真菌的EFB处理高79.2%、36.4%、32.7%和37.6%。经接种AM真菌的EFB处理21天后，Na、K、Ca和Mg的去除率分别为34.4%、61.3%、57.4%和51.9%，分别比未接种AM真菌的EFB处理高11.4%、37.1%、18.3%和24.6%。植物样本分析表明，AM增加了植物对Na的吸收以及Na从根部向地上部的运输，这可能是AM提高EFBs处理含盐废水能力的原因。本研究表明，AM真菌可用于提高EFB修复水污染的能力并提高除盐效率。
